Fuel Pressure
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Elder User
Joined: Aug 2006
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From: KC, MO
Fuel Pressure
What is the correct psi off the shrader valve for our trucks?
I got 37psi while at idle and it had a good strong 600-700rpm idle.
I am trying to solve what seems to be a fuel starvation problem. While I have limited time I am hoping it isn't the fuel pump but I am thinking it is the pump.
at idle it runs strong. While I put it under a load it will starve and have a ticking sound coming from the bay.
Anyone have any other ideas on what might be the fuel starvation problem.
I am going to clean the FPR screen, but I TJ Beggs said that the screen was a return line to the tank and wouldn't cause the fuel restriction.
Thanks for the help,
Flea
I got 37psi while at idle and it had a good strong 600-700rpm idle.
I am trying to solve what seems to be a fuel starvation problem. While I have limited time I am hoping it isn't the fuel pump but I am thinking it is the pump.
at idle it runs strong. While I put it under a load it will starve and have a ticking sound coming from the bay.
Anyone have any other ideas on what might be the fuel starvation problem.
I am going to clean the FPR screen, but I TJ Beggs said that the screen was a return line to the tank and wouldn't cause the fuel restriction.
Thanks for the help,
Flea
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
I noticed your signature says WVO conversion. How long have you been running WVO? Are you running it all the time? That stuff supercleans the fuel system and plugs fuel filters untill it's all cleaned out.
Pressure is not the only test for a fuel problem but it sounds like your pressure is too low, mine bounces between 50-70 @ idle. Are you useing a FP gage or a tire pressure gage?
Your FP may produce enough pressure at idle but not enough volume when you put the engine under a load.
Pressure is not the only test for a fuel problem but it sounds like your pressure is too low, mine bounces between 50-70 @ idle. Are you useing a FP gage or a tire pressure gage?
Your FP may produce enough pressure at idle but not enough volume when you put the engine under a load.
Thread Starter
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Elder User
Joined: Aug 2006
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From: KC, MO
I am running it part of the time, but right now I am not running any WVO. I have changed the filter two days ago.
I am using a tire guage and that is what gives me 37psi.
The lack of fuel is moderaltely noticed while on diesel, while on veggie it coughs and coughs after I get it hot then I have to pull over and stop then wait and then it runs just fine for a while then the problem returns.
I am using a tire guage and that is what gives me 37psi.
The lack of fuel is moderaltely noticed while on diesel, while on veggie it coughs and coughs after I get it hot then I have to pull over and stop then wait and then it runs just fine for a while then the problem returns.
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
You can go though a lot of filters using WVO. You need to get a FP gage for an accurate reading.
Are you making your own WVO. IT can be tricky but I really know nothing about it. You should ask the guys here for more info:
https://www.ford-trucks.com/forums/forum168/
If your FPR screen is plugged the fuel gets hotter than normal and could possibly be aerating.
Are you making your own WVO. IT can be tricky but I really know nothing about it. You should ask the guys here for more info:
https://www.ford-trucks.com/forums/forum168/
If your FPR screen is plugged the fuel gets hotter than normal and could possibly be aerating.
Tuned
Joined: Jun 2004
Posts: 472
Likes: 4
From: Goodyear, AZ
Since FPR seems to be the hot topic does anyone have a picture of it so I know where it is and what to clean??
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Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
I sure do have pics for you.
Here is a pics that shows the engine compartment. The two piece of the FPR that are labeled here are the restiction sensor and the pressure test port. The FPR is that entire assembly bolted to the side of the filter housing
http://good-times.webshots.com/photo...99659029QDJYXr
This picture is of the nut that needs to be removed to shim the FPR
http://good-times.webshots.com/photo...99659029yJVUoi
To clean the screen you should remove the fuel filter and right where the FPR is bolted to the filter housing there is a hole there. the screen is in that hole. Use a small flat screw driver or q-tip to gently clean the screen off. Or you can remove the two 10mm head bolts that hold the FPR on and clean it that way. but the first way is easier the second is more thorough.
Here is a pics that shows the engine compartment. The two piece of the FPR that are labeled here are the restiction sensor and the pressure test port. The FPR is that entire assembly bolted to the side of the filter housing
http://good-times.webshots.com/photo...99659029QDJYXr
This picture is of the nut that needs to be removed to shim the FPR
http://good-times.webshots.com/photo...99659029yJVUoi
To clean the screen you should remove the fuel filter and right where the FPR is bolted to the filter housing there is a hole there. the screen is in that hole. Use a small flat screw driver or q-tip to gently clean the screen off. Or you can remove the two 10mm head bolts that hold the FPR on and clean it that way. but the first way is easier the second is more thorough.
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Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Originally Posted by Flea
Fuel pump isn't going bad b/c it isn't leaking. Is this true with veggie?
Fletch
Fletch
There is a long drawn out procedure for testing the fuel pump flow but the above test has served me in the past for a quick check.
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