fuel pressure
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Junior User
Joined: Sep 2005
Posts: 54
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From: airdrie alberta
fuel pressure
wondering what my fuel line pressure should be on a 351m as the mechanical fuel pump was taken off by previous owner & an inline electric put in it's place?also looking to replace current elec pump as i don't think this one is working right,what should i go with lowor high pressure?any & all help would br appreciated.
Elder User
Joined: Feb 2004
Posts: 830
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From: Indiana
You are better off using a manual fuel pump than a electric one on a stock motor. Not sure what type of electric pump is on your truck currently but if the pressure is to high it will cause the carb to run rich (fuel pressure raises float and floods carb). You could get away with a electric that is a 1-4 psi. If you use one that is 4 - 9 psi than you would have to use a fuel pressure regulator that is a 1- 4 psi. Hopes this helps.
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Junior User
Joined: Sep 2005
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From: airdrie alberta
thanks.guy at parts store said i would be alright with a 5-9psi without a regulator saying that the manual ones put out 4-7psi so i'll definetly look into a regulator.thanks.
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Junior User
Joined: Sep 2005
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From: airdrie alberta
well i got the one that's on there now to work by running a line off of a gerry-can but it pisses out where the fuel line goes into carb,yet it won't draw out of tank.I think i have a block somewhere between tank & pump.by the way carb is new as well as tank and sending unit.any suggestions?
Elder User
Joined: Nov 2003
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From: Stanly County N.C.
Are you sure the line from the tank to the pump is not porus? I had a similar problem where the line had several small holes that DID NOT leak fuel but would suck air when you tried to draw fuel from the engine compartment. And 4-7 psi is where you want to be.
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Junior User
Joined: Sep 2005
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From: airdrie alberta
that's my next step is to cun a new or temp line straight from tank to pump and see if that is my problem.can't seem to find a part's store here in canada that carries a fuel pressure regulator.
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Junior User
Joined: Dec 2005
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From: Estes Park
If it was me I'd put the stock pump back on the engine. replace all the rubber line and blow out the steel lines with the compressed air. Rubber line is cheap enough. Air is almost free. and in the end you will save alot of time and cash. If you have dual tanks also check the tank selector valve. I ran into this once were on tank was empty, and the outher had a couple gallons, and the valve was stuck half open so it was sucking a little fuel from one tank, and air from the outher. Good luck Jesse.
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can't seem to find a part's store here in canada that carries a fuel pressure regulator.
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Mopac will have it .
http://www.mopacautosupply.com/
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Mopac will have it .
http://www.mopacautosupply.com/
Thread Starter
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Junior User
Joined: Sep 2005
Posts: 54
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From: airdrie alberta
pump's mounted on driver's side fire wall,as for mechanical pump it was never there when i got the truck.truck was also on propane mainly for last 14yrs which as why i had to replace carb and tank due to drying out of carb and extreme rust through on tank.thank's guys for all the info,i'm sure i'll be asking for more help later.
Senior User
Joined: Oct 2001
Posts: 142
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From: Savannah USA
I got a question about fuel pressure.
When sitting at a light my fuel pressure raises up to roughly 8 or 9 psi (heavy traffic), I have a regulator set to 2psi.
I'm using a mechanical fuel pump w/ 3/8" fuel line on a 302 with aluminum intake and 650 4bbl carb
Is it the fuel line causing it to get that high.
TailGater_73F100
Savannah, GA
When sitting at a light my fuel pressure raises up to roughly 8 or 9 psi (heavy traffic), I have a regulator set to 2psi.
I'm using a mechanical fuel pump w/ 3/8" fuel line on a 302 with aluminum intake and 650 4bbl carb
Is it the fuel line causing it to get that high.
TailGater_73F100
Savannah, GA
Last edited by TailGater_73F100; Dec 31, 2005 at 08:07 AM.