New fuel pump= flooding and gas every whare.

[71gmcC15]

I ordered a holly inline pressure regulator with a mr gasket gauge and some 3/8 fittings. That sould be every thing I need.

[akart]

Originally Posted by 71gmcC15

I have ran this q jet for 2 years never messed with any thing. So the chases of the needle clip being installed wrong is out the window. I replaced the old pump with a new one because it was leaking realy bad. There is a inline fule filter. I dont have any of the original hard line left. As for the incarb filter being missing. Have know idea if its there or not never touched it. It was just fine till I put a new pump on. Pressure from the pump can blow passed the needle and seat if it's to much. I ordered a regulator. If that doesn't fix it then I gess I'm going to eldbrock

If you go w/an Edelbrock you will have to get there fuel pump which puts out 6 lbs or regulate your current pump to put out 6 lbs. I have one and am very happy w/it. Check this forum for jet and needle suggestion as stock can be a little rich,easy to change out. The Q-Jet manifold won't work w/an Edelbrock and a new Manifold to fit isn't that much and I hear adapters aren't that good, so it's good to go w/ a new manifold.
What the heck it's just money.

[Daron65]

Originally Posted by 71gmcC15

I ordered a holly inline pressure regulator with a mr gasket gauge and some 3/8 fittings. That sould be every thing I need.

I used the same basic set up. It worked very well for me. Try to find a place to secure the regulator. Keep us updated.

[54blackhornet]

First a QJet on a 307 is overkill. Second they only need about 3/4 lbs. third why replace the carb if it was fine before ? Way to much pressure. I have a fuel regulator if you need one ..Jack

[71gmcC15]

Originally Posted by 54blackhornet

First a QJet on a 307 is overkill. Second they only need about 3/4 lbs. third why replace the carb if it was fine before ? Way to much pressure. I have a fuel regulator if you need one ..Jack

I got a regulator orderd. Not going to change it if that's the problem. And there's no kill like overkill.

[buds56]

I put a new fuel pump on a Chevy truck I had from NAPA and the carb started flooding.

I rebuilt the Qjet and it still flooded eventually I put a pressure gauge on it and it was putting out 12 lbs.

I got another pump and it was fine.

I believe the quality control is just not there anymore on parts.

That was my experience. Good luck

[BigBird05]

BUDS56, Best answer I have read.

[dmjlambert]

I'm just curious about this. Why buy a mechanical fuel pump for an 80s chevy pickup if you're going to put it on a 71 pickup? When I needed a fuel pump for my 69 pickup, I just went up to the car parts store and got the pump for a 69 pickup. I took the old one with me to the parts store so I could be sure it matched exactly. That way I didn't need to change the fuel fittings or fuel lines.

[71gmcC15]

Originally Posted by dmjlambert

I'm just curious about this. Why buy a mechanical fuel pump for an 80s chevy pickup if you're going to put it on a 71 pickup? When I needed a fuel pump for my 69 pickup, I just went up to the car parts store and got the pump for a 69 pickup. I took the old one with me to the parts store so I could be sure it matched exactly. That way I didn't need to change the fuel fittings or fuel lines.

That's all they had. They did not have one for my pickup but they did for 80s chevy. I figured they would be the same besides the carb feed tube. Wich is not a big deal

['68OrangeSunshine]

Originally Posted by buds56

I put a new fuel pump on a Chevy truck I had from NAPA and the carb started flooding.

I rebuilt the Qjet and it still flooded eventually I put a pressure gauge on it and it was putting out 12 lbs.

I got another pump and it was fine.

I believe the quality control is just not there anymore on parts.

That was my experience. Good luck

Quality control of our vintage parts has gotten to be a big problem lately.
I got a new fuel pump from O'Reilly's, when the old one on my '71 GMC Jimmy w/ 350 SBC blew out after several years. This Chinese pump lasted 100 miles until it started spewing raw gas. I got my money back after being towed home. Then I tried another fuel pump from Auto Zone. Delphi, "Made in Troy, Michigan," they said. It was made in Korea. It lasted a year, then stopped pumping.
I called my local NAPA, they had stopped selling mechanical fuel pumps for SBCs, and suggested I convert to electrical. No thanks.
Finally I got an AC Delco pump at Merle's, a local auto parts outfit, and it's OK for now.
When I saw a woman on Craigslist had a NIB Carter mech fuel pump for a 350 for $15, I jumped on it. They had kept it as a spare in their motor home.

I found similar problems with getting a P/S gearbox replaced under a lifetime warranty. O'Reilly's paid me $300 to 'buy out' my Checker Auto Lifetime Guarantee on P/S gearboxes, when they couldn't get that vintage part anymore. And Auto Zone stopped listing parts for trucks over 50 years old.
I came out ahead by buying a reman Cardone gearbox from Rock Auto, but it's no longer warrantied.
Auto parts stores don't respect our vintage rigs as dependable work trucks anymore. It's just a hobby toy to them, so any shiny-looking part wil do.

[tim_mc]

Having an Edelbrock carb, I knew I had to limit the fuel pressure and that the mechanical fuel pump was likely putting out 9PSI or higher. I wasn't sure if the Mr Gasket 9710 1-6PSI regulator was doing the job or not, so I also installed this VDO fuel pressure gauge and was pleasantly surprised to see it was made in the USA. Summit P/N VDO-153002, $20.57.

[72c20customcamper]

Originally Posted by '68OrangeSunshine

Quality control of our vintage parts has gotten to be a big problem lately.
I got a new fuel pump from O'Reilly's, when the old one on my '71 GMC Jimmy w/ 350 SBC blew out after several years. This Chinese pump lasted 100 miles until it started spewing raw gas. I got my money back after being towed home. Then I tried another fuel pump from Auto Zone. Delphi, "Made in Troy, Michigan," they said. It was made in Korea. It lasted a year, then stopped pumping.
I called my local NAPA, they had stopped selling mechanical fuel pumps for SBCs, and suggested I convert to electrical. No thanks.
Finally I got an AC Delco pump at Merle's, a local auto parts outfit, and it's OK for now.
When I saw a woman on Craigslist had a NIB Carter mech fuel pump for a 350 for $15, I jumped on it. They had kept it as a spare in their motor home.

I found similar problems with getting a P/S gearbox replaced under a lifetime warranty. O'Reilly's paid me $300 to 'buy out' my Checker Auto Lifetime Guarantee on P/S gearboxes, when they couldn't get that vintage part anymore. And Auto Zone stopped listing parts for trucks over 50 years old.
I came out ahead by buying a reman Cardone gearbox from Rock Auto, but it's no longer warrantied.
Auto parts stores don't respect our vintage rigs as dependable work trucks anymore. It's just a hobby toy to them, so any shiny-looking part wil do.

Problem with older NOS or NIB fuel pumps is if they were made pre ethonal they wont last very long. The rubber diafram will turn to mush . Had it happen on my Studebaker older AC Delco in the box never used lasted a few months .

[71gmcC15]

Originally Posted by 72c20customcamper

Problem with older NOS or NIB fuel pumps is if they were made pre ethonal they wont last very long. The rubber diafram will turn to mush . Had it happen on my Studebaker older AC Delco in the box never used lasted a few months .

Dont run ethonal. Problem solved.

['68OrangeSunshine]

Originally Posted by 72c20customcamper

Problem with older NOS or NIB fuel pumps is if they were made pre ethonal they wont last very long. The rubber diafram will turn to mush . Had it happen on my Studebaker older AC Delco in the box never used lasted a few months .

Good point. The last 2 or 3 fuel pumps were Asian. I thought that was the reason. They should have adapted to the newer fuel formula by now, but only if they care.
I have a 1963 model year 292 L6 core. It has a rebuildable fuel pump. [If you can still get the kit.] The kit cost more than a complete later pump. I always figured to ''upgrade'' to a later style non-rebuildable fuel pump, when the time came to put it on the road, but now, if I can get an alcohol-compatible diaphragm for it, that will be better. [Big IF.]
Of course the L6 fuel pump is not the same part as an SBC. It works ''upside-down'' to the small block's orientation. But maybe 283s, 327s of the same vintage used a rebuildable style?

[71gmcC15]

Got the regulator installed today. I was getting 9 psi. Haven't adjusted it because when I installed the fittings I could not find any thread sealer. Being pipe thread I thought maby i could get buy with out it. Well i cant. It leaked really bad. So i have to take it back off and seal the fitting. Not a big deal.

[Daron65]

I believe you will see a great difference once you have everything installed. Once its warmed up and you find the pressure the engine likes, you will need to retune it with vaccuum gauge. It worked very well for me. Good luck.

[KQQL IT]

Originally Posted by 71gmcC15

Got the regulator installed today. I was getting 9 psi. Haven't adjusted it because when I installed the fittings I could not find any thread sealer. Being pipe thread I thought maby i could get buy with out it. Well i cant. It leaked really bad. So i have to take it back off and seal the fitting. Not a big deal.

9lbs is what my new fuel pump did too.
2 fuel pumps 1 carburetor and a regulator is all it needed.

[Grandma’s 68]

I’ve been living with my engine dying occasionally at idle for a while now on my 68 C10. The Quadrajet carb was ‘rebuilt’ and new fuel pump installed by an overly expensive ‘mechanic’ as part of a barn find resurrection (last run around 1997). The latest theory is basically captured in this thread, so I plan on adding the regulator and gauge. The engine and carb is from a 1981 G30.

However when doing an initial check on fuel pressure, the gauge is jumping about very violently as in the attached video clip at idle (non oil filled gauge). It’s not so bad at higher rpms. The pump was from NAPA https://www.napaonline.com/en/p/CFPB0196P. NAPA website says it doesn’t fit, but it physically does and everything works pretty well, except at idle.

Is there a problem with this particular fuel pump, in addition to it putting out too much pressure for the Quadrajet?

Thanks.

[Grandma’s 68]

Initial attachment didn’t work, so trying again.

[Steeveedee]

Fuel pumps have poppet valves in them, so that's pretty much how it should look.

[Grandma’s 68]

Thanks for that feedback.

I notice NAPA has a 5.5psi pump https://www.napaonline.com/en/p/CFPB...rdInput=b0189p. It has 25gph flowrate. The 9psi pump currently on the truck is rated at 40gph. Will the 25gph pump be an issue on stock engine? I have not and do not intend to hotrod the truck.

Is it best to stick with the higher flowrate pump (which looks more like the service manual (see screenshot) and add the extra complication of regulator and gauge, or keep it simple with a more suitable pressure output pump?

The NAPA 5.5psi,25gph pump looks more like the one for the 6 cylinder (other screenshot). The two pumps look like they are oriented 180deg different. Does the orientation of the pump matter?

Thanks.

[Steeveedee]

The 6-cyl pump runs off a cam lobe back further from the cam lobe that the V-8 pumps run on. Different strokes, I'd bet money, and the lever arms are probably different. What sort of problem(s) are you having with the current fuel pump? I notice that the cubic inches in the two V-8 pics are different. My recommendation would be to use the standard pump for your application.

[Grandma’s 68]

I’m trying to figure out what the ‘standard’ pump is. The 9psi pump seems to be the cause of the Quadrajet dying at idle, probably due to flooding. It seems the general solution is slap on a regulator, which seems like it’ll fix the issue.

I discovered you can get a lower pressure pump at NAPA, that may be a more suitable pump. I was thinking that the 5.5psi NAPA pump may be the better ‘standard’ pump, but it says it only fits the 6 cylinder engine. The flowrate is probably okay at 25gph. I was under the impression the pump interface was standard, but perhaps not. So with the orientation of the 6 cylinder’s pump being inverted compared to the V8, that may be an issue (or not).

I guess I’ll just get the 5.5psi pump and try it out.

[dmjlambert]

I suggest get from Autozone the Delphi brand fuel pump for a 1969 or 1970 C10 with 350 engine. I got that one and it works well with my Quadrajet and I used it with gasohol with no problems for 2.5 years so far. I have a 1969 350 engine but the Quadrajet is from the mid 80's. My fuel pump also only has a fuel inlet and fuel outlet. It doesn't have that 3rd port you show in the picture of the fuel pump on the NAPA website. Where are you even going to connect that extra port on a 1968 truck? The fuel systems in the 1970 and earlier trucks were simple and didn't have vent lines that go to charcoal canisters, didn't have fuel return lines, and all that jazz. They just had a vented cap on the fuel tank, and a single fuel line to the pump and then to the carburetor, and that's it.

[Steeveedee]

Originally Posted by Grandma’s 68

I’m trying to figure out what the ‘standard’ pump is. The 9psi pump seems to be the cause of the Quadrajet dying at idle, probably due to flooding. It seems the general solution is slap on a regulator, which seems like it’ll fix the issue.

I discovered you can get a lower pressure pump at NAPA, that may be a more suitable pump. I was thinking that the 5.5psi NAPA pump may be the better ‘standard’ pump, but it says it only fits the 6 cylinder engine. The flowrate is probably okay at 25gph. I was under the impression the pump interface was standard, but perhaps not. So with the orientation of the 6 cylinder’s pump being inverted compared to the V8, that may be an issue (or not).

I guess I’ll just get the 5.5psi pump and try it out.

DON'T buy a 6-cyl fuel pump for a V-8. I'm done with this thread.