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I've tried to use the search feature to get some previous info on this but for some reason, i get all kinds of results that have nothing to do with anything.
I think my fuel pump is starting to give out. The truck has cut out 2 times already as i was cruising down the Hwy. Once i coast to a stop on the side of the road and try to restart the engine, it will light right up with no evidence of any problems.
The tank is almost full so i need to run it down first before i drop it to clean it out. I might as well go thru the entire fuel system to be sure.
My question, is there a way to figure what fuel pump size (g.p.h.) and line size for specific applications? The stock system worked fine up till now and i dont think the original design inhibited the motor. I do want to upgrade but i dont need to over do it.
Right now the the V-8 is a little better than stock and it never sees anything above 4000 r.p.m. but a 383 and lower gearing could make it's way in to the truck in the future.

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Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.

I'm stumped too on the stock fuel pumps gph but you would probably be okay with just going to a higher pressure fuel pump.

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1975 V8 Luv
1980 Bagged Luv

for a mild to medium performance motor a Holley "Blue" pump is a decent pump. it should provide reliable fuel flow up to 500hp no problem.

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1978 LUV Truck 2WD
450 "Small Block" Chevy
3.70 Ford 9
28x10 Goodyears

I looked up some info on the Holley Blue pump and it sounds like a good plan. I haven't decided to use the stock pump relay or going with a replacement relay for the new pump.
Has anyone modified their fuel tank to accept larger lines?

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Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.

i was running a holley red with my weber setup.....97 gph 4.5-7 psi.

i'm currently using it to transfer fuel,. beware....the holley pumps are LOUD.
i could hear mine all the time, unless i had the secondaries open.(Whhrrrr), you'll need a box that doesn't transfer the vibration to the luv body, it resonated pretty bad in my truck,

it all depends what you're supplying with it.....if it's a hitachi or weber you don't want to go any higher than 7 psi, nominaly 4.5 psi. i can't for the life of me remember if your truck has a 1.8 or not.

however, if you're in need of a pump.....you can have mine for $25 iit has short leads(4-6") but worked great, got it off e-bay for 30-40 bucks

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dont let those rat bastards at napa or any other automotive stores tell you that the luv takes a special pump, they almost got me on the stock pump that cost 108 bucks but i got the cheapy for like 15 and it worked fine.

Im feeding a Holley 600 c.f.m. 4 bbl, vac secondary carb. Im pretty much sold on the "Blue" pump because since im going to drop the tank and clean it out, i might as well upgrade the entire system.

_________________
Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.

Before replacing, check your fuel line to see if it is heated up by the headers. I had the problem of vapor locking--my fuel was boiling in the line and vapor-locking on me. Rerouted the line inside the frame and it fixed the problem. Just a thought before you redo your gas lines and you still have the problem.
I could pull over, get some water and pour on the fuel line to cool it down, fire it up and be on my way. (of Course, i wouldn't get very far--I would have to do it again)

Im certian that the problem isn't vapor lock. My problems just started recently and it very intermittent. Even with the Buick motor things were just fine. As old as the truck is and the fact that the fuel pump is at least 8 years old, it has to be pump/fuel pickup related.
I just bought a new fuel pump and braided line for the new system. I got an Edelrock 1791 fuel pump. It flows 120 g.p.h. 3/8 lines. I was sold on the Holley Blue Pump but the parts man told me about the Edelbrock unit that runs quite compared to the Holley unit. It cost more, but this one wont rattle the truck.
I got the tank ran down to 1/4 of a tank but with the sending unit reading weak, it still has about 6 gal. of fuel in it. Once i get it really low, i'll be able to drop the tank and flush it out, do the mods needed to accept the bigger lines and build the new system.

_________________
Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.

That sounds like it had a problem skipping timing as well.

My problem is the carb got overly caked with gunk and died. New Carb and Cha-Ching - Fast and Furious.

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More LUV than one man could ever need - Spread the LUV!
- 1976 Chevy Longbed - Daily Driver
- 1981 Chevy Shortbed 4X4 - Needs Help!
- 1981 Chevy Luv 4X4 - Newly put together

Holley "Blue" pumps are popular because they are pretty inexpensive and are easy and cheap to service (rebuild). I swear by them for street/strip applications. IMO they aren't that loud.

if you have a little extra $$$ then a Mallory Comp 140 is another good pump but thats kinda loud. And then theres the little known secret ...another good pump for mild to medium performance engines is a Carter (TRW). http://www.jegs.com/images/photos/180P4600HP.jpg its a true plug and play pump. the internal regulator makes it a brainless application. I used to keep a 6-8psi 72GPH Carter in the tool box as a spare for my tow vehicle but one time at the strip i had to use it on the car I was running. It held up fine behind a 550hp motor spinning 8000rpm all day long. You can barely hear this one.... and its very inexpensive.

I've never used an Edelbrock before. Lemme know how you like it.

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1978 LUV Truck 2WD
450 "Small Block" Chevy
3.70 Ford 9
28x10 Goodyears

I got the Edelbrock pump fitted to the truck along with new -6 braided fuel line. The old fuel feed line is now the return line. I ran out of braided line so i adapted some of the old stuff to the system. I'll fix it up later. The Edelbrock pump has a buzzing feel at idle. It's almost annoying but i'll most likely get used to it. It felt good to drive it again and now im not concerned with the thought of having trash in the tank.

_________________
Previous setup: 4.1 Buick V-6/TH 350
Current setup: 400 Small Block Chevy V-8/TH 350
9" ford rear end/short bed/blue
What do Water, Electricity and Humans have in common... They all travel the path of least resistance.