This new girl has a problem! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

babydoll · 09-02-2011, 11:29 AM

Hi everyone! My first post!

On hot days (above 93) my truck ('72 Cheyenne Super) runs really rough and if I don’t play with the gas and keep high rpm it dies and won’t start until it cools down a little and then only if I hold the gas to the floor as if it were flooded. There is no cooling problem as the temp stays around 195. My boyfriend thinks it’s vapor locking but is there another possible explanation?
Thanks!

kingsolver72 · 09-02-2011, 11:34 AM

Welcome to the board..Its sounds like your boyfriend is correct. I had an old falcon with an electric fuel pump that would vapor lock on hot days.

BMERDOC · 09-02-2011, 12:35 PM

Welcome! If it has a filter in the engine compartment make sure its on the pressure side of the pump and not the suction side.

PanelDeland · 09-02-2011, 01:22 PM

You might also look at the way the fuel line is routed.If it runs near manifolds,or exhuast ,you may be able to reroute it to keep the fuel cooler in it.

C20-67_N_MO · 09-02-2011, 01:47 PM

Quote:

Originally Posted by PanelDeland

You might also look at the way the fuel line is routed.If it runs near manifolds,or exhuast ,you may be able to reroute it to keep the fuel cooler in it.

Good advise.

Plus keep the fuel lines away from the raditor hoses if it all possible as well.

Good luck and welcome to the board!!

Shyguy · 09-02-2011, 01:48 PM

Good suggestions in previous posts. What engine and carb does your truck have?

Some carbs, especially Edelbocks, are affected by heat some and need a phenolic spacer between them and the intake to prevent float bowl boil problems.

babydoll · 09-02-2011, 02:50 PM

Thank you so much for the warm welcome and advice!!

I'm pretty sure the filter is on right since this only happens on hot days. Totally agree with checking the lines for heat sources. I have a spacer on the intake for the quadrajet carb, but perhaps need a thicker one? I’m also thinking of getting a 185 thermostat, which was the original anyway.

By the way, here's a picture of my baby!

Double Stack · 09-02-2011, 03:09 PM

Nice truck!

Shyguy · 09-02-2011, 09:19 PM

Quote:

Originally Posted by babydoll

Thank you so much for the warm welcome and advice!!

I'm pretty sure the filter is on right since this only happens on hot days. Totally agree with checking the lines for heat sources. I have a spacer on the intake for the quadrajet carb, but perhaps need a thicker one? I’m also thinking of getting a 185 thermostat, which was the original anyway.

By the way, here's a picture of my baby!

Great looking truck.

Q-jet carbs are also bothered by heat. A metal spacer does little to help with that, it has to be phenolic. Also Q-jets have a problem with leaks in the bottom of the carb that can cause problems.

I usually run a 180 degree thermostat, but 185 should work also.

C20-67_N_MO · 09-02-2011, 03:10 PM

Wow!

Nice looking truck.

And it's kinda cool to see a bed that is painted white too.

srvivor71 · 09-02-2011, 04:01 PM

Welcome from Upstate NY! Beautiful truck! I'm really glad you brought this up because my truck was running poorly during some very hot weather earlier this summer. I'll be looking at this over the weekend.

babydoll · 09-02-2011, 04:37 PM

Interesing you should say that about the bed. We're not crazy about it. Thinking about a wood bed, in which case the sides would be red, I assume. And the top of the cab needs to be white, of course.

71meangreenc10 · 09-02-2011, 04:56 PM

Nice Truck.....

Smitty

OhOneWS6 · 09-02-2011, 06:06 PM

You can try clipping wooden clothes pins to the fuel line. Put as many as you can fit. The wood will act as a heat sink. This is not a pretty fix but it may help you diagnose that it is in fact a vapor lock issue.

sanford66 · 09-02-2011, 09:29 PM

I think you have my trucks twin! Nice truck and welcome from Kansas. Joseph

babydoll · 09-06-2011, 06:09 PM

That is amazing, Joseph! Thank you for sharing! We will, of course, be painting the top of the cab white.

71swb4x4 · 09-02-2011, 09:36 PM

If your timing is too far advanced it can do the same thing.

Meatman · 09-02-2011, 11:24 PM

Quote:

Originally Posted by 71swb4x4

If your timing is too far advanced it can do the same thing.

Another good idea there. That usually makes it hard to start too.

bigsnookmaster · 09-03-2011, 08:58 AM

Welcome to the board from Florida! Nice truck! And nice to see another chick into these trucks! You are at the right place!!!

**70cst** · 09-03-2011, 09:17 AM

and

from Ohio. That is one

truck you have.

MagmaJct · 09-03-2011, 11:15 AM

Clothes pins on a fuel line? Was that optional equipment for trucks destined for hot climates? Come on, we have a female who likely doesn't want to be "taken for a ride". Show some professionalism. Now for my comment...

In addition to the vapor lock problems, check the fuel pressure, as vapor lock can be a sign of a failing fuel pump. In addition, the problem could be over heating, float level set to high. What engine and carb does the engine have?

babydoll · 09-06-2011, 06:08 PM

Quote:

Originally Posted by bigsnookmaster

Welcome to the board from Florida! Nice truck! And nice to see another chick into these trucks! You are at the right place!!!

You go gurl!!

**special-K** · 09-03-2011, 02:16 PM

I always run 180 degree thermostats in these trucks.

jmedero · 09-03-2011, 02:59 PM

I was vapor locking on the power tour last year. My tank on my nova just needed to be vented better. Some fuel line and a filter on the end and boom. Did the last two stops of the tour with no problem. It was in the 110 deg range those days.
Posted via Mobile Device

kevmic28 · 09-03-2011, 03:12 PM

I had the same issues. took off the rochester and put on a edelbrock. Still have some issues when its over 100 but not as bad as before.

09-02-2011, 11:29 AM	#1
babydoll Registered User Join Date: Aug 2011 Location: Indianapolis, IN Posts: 12	This new girl has a problem! Hi everyone! My first post! On hot days (above 93) my truck ('72 Cheyenne Super) runs really rough and if I don’t play with the gas and keep high rpm it dies and won’t start until it cools down a little and then only if I hold the gas to the floor as if it were flooded. There is no cooling problem as the temp stays around 195. My boyfriend thinks it’s vapor locking but is there another possible explanation? Thanks!

09-02-2011, 11:34 AM	#2
kingsolver72 10/30/19 Join Date: Aug 2004 Location: ottawa kansas Posts: 5,245	Re: This new girl has a problem! Welcome to the board..Its sounds like your boyfriend is correct. I had an old falcon with an electric fuel pump that would vapor lock on hot days. __________________ Fight the good fight, finish the race, keep the faith

09-02-2011, 12:35 PM	#3
BMERDOC Registered User Join Date: Jun 2011 Location: Richmond,Va Posts: 2,934	Re: This new girl has a problem! Welcome! If it has a filter in the engine compartment make sure its on the pressure side of the pump and not the suction side. __________________ Nick Carter 1967 C10 Short bed Fleetside Project Cheap Thrills! 2WD C10 Modern/Performance Alignments Easiest Alignment Ever!

09-02-2011, 01:22 PM	#4
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,992	Re: This new girl has a problem! You might also look at the way the fuel line is routed.If it runs near manifolds,or exhuast ,you may be able to reroute it to keep the fuel cooler in it. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

09-02-2011, 01:48 PM	#6
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: This new girl has a problem! Good suggestions in previous posts. What engine and carb does your truck have? Some carbs, especially Edelbocks, are affected by heat some and need a phenolic spacer between them and the intake to prevent float bowl boil problems. __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

09-02-2011, 02:50 PM	#7
babydoll Registered User Join Date: Aug 2011 Location: Indianapolis, IN Posts: 12	Re: This new girl has a problem! Thank you so much for the warm welcome and advice!! I'm pretty sure the filter is on right since this only happens on hot days. Totally agree with checking the lines for heat sources. I have a spacer on the intake for the quadrajet carb, but perhaps need a thicker one? I’m also thinking of getting a 185 thermostat, which was the original anyway. By the way, here's a picture of my baby! Attached Images

09-02-2011, 03:09 PM	#8
Double Stack Registered User Join Date: Aug 2011 Location: Oregon Posts: 82	Re: This new girl has a problem! Nice truck!

09-02-2011, 03:10 PM	#10
C20-67_N_MO Champagne Taste on Beer Budget Join Date: Dec 2008 Location: High Ridge, Missouri Posts: 2,190	Re: This new girl has a problem! Wow! Nice looking truck. And it's kinda cool to see a bed that is painted white too. __________________ Coming Soon: Project 1970 Country Truck

09-02-2011, 04:01 PM	#11
srvivor71 Registered User Join Date: Sep 2010 Location: Sullivan County, NY Posts: 455	Re: This new girl has a problem! Welcome from Upstate NY! Beautiful truck! I'm really glad you brought this up because my truck was running poorly during some very hot weather earlier this summer. I'll be looking at this over the weekend.

09-02-2011, 04:37 PM	#12
babydoll Registered User Join Date: Aug 2011 Location: Indianapolis, IN Posts: 12	Re: This new girl has a problem! Interesing you should say that about the bed. We're not crazy about it. Thinking about a wood bed, in which case the sides would be red, I assume. And the top of the cab needs to be white, of course.

09-02-2011, 04:56 PM	#13
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,179	Re: This new girl has a problem! Nice Truck..... Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 69 C30 Former Motor Home, Flat Bed time 70 G20 Red-E-Kamp Conversion "I'm your Boogy Van"

09-02-2011, 06:06 PM	#14
OhOneWS6 Registered User Join Date: Dec 2009 Location: DFW, TX Posts: 764	Re: This new girl has a problem! You can try clipping wooden clothes pins to the fuel line. Put as many as you can fit. The wood will act as a heat sink. This is not a pretty fix but it may help you diagnose that it is in fact a vapor lock issue. __________________ 72 Cheyenne Super 1/2 LWB White/Dark Yellow 07 Avalanche 2LT 74 Sleek Craft Rebel Jet Boat W/Pontiac 400

09-02-2011, 09:29 PM	#15
sanford66 Registered User Join Date: Jun 2007 Location: Everest Ks Posts: 749	Re: This new girl has a problem! I think you have my trucks twin! Nice truck and welcome from Kansas. Joseph Attached Images __________________ 1970 Chevelle Nomad station wagon 1966 C-10 lwb,250-six,granny 4speed 1966 C-10 lwb,factory A/C,Custom Cab 1954 Delray 2-door sedan [rat rod project]

09-06-2011, 06:09 PM	#16
babydoll Registered User Join Date: Aug 2011 Location: Indianapolis, IN Posts: 12	Re: This new girl has a problem! That is amazing, Joseph! Thank you for sharing! We will, of course, be painting the top of the cab white.

09-02-2011, 09:36 PM	#17
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	Re: This new girl has a problem! If your timing is too far advanced it can do the same thing. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.



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09-03-2011, 08:58 AM	#19
bigsnookmaster Registered User Join Date: Jan 2008 Location: St.Petersburg,Fl Posts: 1,267	Re: This new girl has a problem! Welcome to the board from Florida! Nice truck! And nice to see another chick into these trucks! You are at the right place!!! __________________ greg http://community.webshots.com/user/68406Stepside

09-03-2011, 09:17 AM	#20
70cst Senior Member Join Date: Feb 2001 Location: New Madison, Ohio Posts: 21,373	Re: This new girl has a problem! and from Ohio. That is one truck you have. __________________ A husband can be right...or...A husband can be happy. 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder!

09-03-2011, 11:15 AM	#21
MagmaJct Registered User Join Date: May 2008 Location: Mesa, AZ Posts: 281	Re: This new girl has a problem! Clothes pins on a fuel line? Was that optional equipment for trucks destined for hot climates? Come on, we have a female who likely doesn't want to be "taken for a ride". Show some professionalism. Now for my comment... In addition to the vapor lock problems, check the fuel pressure, as vapor lock can be a sign of a failing fuel pump. In addition, the problem could be over heating, float level set to high. What engine and carb does the engine have? __________________ I own 3 classic vehicles. 1971 LWB C10 Deluxe. 1974 VW Super Beetle. 1971 VW Fastback. The C10 and the Super Beetle run, the Fastback is just not there yet! Please visit my Super Beetle and Fastback profile on TheSamba.

09-03-2011, 02:16 PM	#23
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: This new girl has a problem! I always run 180 degree thermostats in these trucks. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

09-03-2011, 02:59 PM	#24
jmedero Registered User Join Date: Jun 2008 Location: pensacola fl Posts: 3,073	Re: This new girl has a problem! I was vapor locking on the power tour last year. My tank on my nova just needed to be vented better. Some fuel line and a filter on the end and boom. Did the last two stops of the tour with no problem. It was in the 110 deg range those days. Posted via Mobile Device __________________ 68 BB burb build thread Scott's super slam front/rear http://67-72chevytrucks.com/vboard/s...d.php?t=378084

09-03-2011, 03:12 PM	#25
kevmic28 Registered User Join Date: Jun 2009 Location: Arlington Texas Posts: 602	Re: This new girl has a problem! I had the same issues. took off the rochester and put on a edelbrock. Still have some issues when its over 100 but not as bad as before. __________________ 1970 GMC truck 1988 Harley 1200 Sportster

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