electric fuel pump

[CJJ67]

I have a 67 stepside with a 350 sbc motor. I moved the gas tank from the cab and replaced it with the suburban tank on the rear frame this weekend. My problem is that the carb doesn't seem to get enough gas on start up. There is no gas in the filter, but as you keep turning over the motor, it eventually starts and runs fine. No stalls when driving or accelerating. If you let it sit for a while, the problem is there again. I hooked the lines on the tank up as: filler line and vent line is good, but the two remaing vent lines I installed a vent plug/valve like you would use on a motorcycle. What I was thinking was that maybe the gas lines that I used are too big for the mechanical fuel pump. I had some clean 3/8 in. stainless steel tubing left over and I used that. If this is the problem, would an electric fuel pump help or do I need to use smaller fuel line. Oh yeah, I've already used compressed air to blow out the lines and I installed the tank over two years ago, just never got around to hooking it up.

Thanks for the help

[cdowns]

3/8 should b just fine// look at your carb/ having a non mettalic spacer should help to prevent fuel from perking out of the carb when ts hot

my belief is electric fuel pumps cause alot more problems than they solve

[71tahoe]

Originally Posted by cdowns

3/8 should b just fine// look at your carb/ having a non mettalic spacer should help to prevent fuel from perking out of the carb when ts hot

my belief is electric fuel pumps cause alot more problems than they solve

Exactly. 3/8 line should be fine. I'm sure V8 blazers and burbs had 3/8 from the factory.

[jeffro788]

I wouldn't recommend an electric fuel pump for a cruiser. I had a Holley Blue and it was louder than the motor. I am also running 3/8 line with a GM Performance mechanical fuel pump and have had no problem, is there not some sort of valve in the pump to keep fuel from draining backwards?

[riche]

I think Mech fuel pumps are more reliable, so that is why I installed the carter electric fuel pump!!! I just can never do things easy!!!
I pulled the tank from the cab and ran a 3/8 line from the back to the front. The carter pump is not as loud as the holly and summit if you install it on the bracket right with the grommets. If not it will resonate through the whole frame!!!

[CJJ67]

Thanks a lot for the help and advise. As always, great group.

[Longhorn Man]

all 4 bbl v 8 67 - 72 trucks got 3/8 inch lines.
there is no problem with the fuel pump dropping the line pressure. The engine doesn't run off whats in the line, it runs off whats in the bolw of the carb anyways.

[oldcarfart]

Originally Posted by CJJ67

I have a 67 stepside with a 350 sbc motor. I moved the gas tank from the cab and replaced it with the suburban tank on the rear frame this weekend. My problem is that the carb doesn't seem to get enough gas on start up. There is no gas in the filter, but as you keep turning over the motor, it eventually starts and runs fine. No stalls when driving or accelerating. If you let it sit for a while, the problem is there again. I hooked the lines on the tank up as: filler line and vent line is good, but the two remaing vent lines I installed a vent plug/valve like you would use on a motorcycle. What I was thinking was that maybe the gas lines that I used are too big for the mechanical fuel pump. I had some clean 3/8 in. stainless steel tubing left over and I used that. If this is the problem, would an electric fuel pump help or do I need to use smaller fuel line. Oh yeah, I've already used compressed air to blow out the lines and I installed the tank over two years ago, just never got around to hooking it up.

Thanks for the help

3/8" OK, inlet check valve on fuel pump may be dirty or worn, also a small
(4") loop in fuel line about 12" back from fuel pump will prevent total fuel drainback to tank.