High(er) fuel pressure at wot - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 10 (permalink) Old 04-02-2008, 02:36 AM Thread Starter
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High(er) fuel pressure at wot

Ok, so i installed my fuel pressure gauge today and im not happy to say the least. I bled the lines of air and the truck runs and starts. However the fuel pressure gauge is acting erratic. When first started it will go up to about 14psi then go down to about 3.5 psi and stay there. At wot, it RISES to about 16 or 17. I have no idea why my gauge is acting backwards like this.

Eric

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post #2 of 10 (permalink) Old 04-02-2008, 04:32 AM Thread Starter
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THe gauge is an electric glowshift and the sender is mounted in the banjo bolt replacement that i ordered from vulcan performance which is mounted in the port in the injection pump. Wasnt i supposed to replace the original banjo bolt?

I tried to unscrew the sensor, i checked the wiring and reinstalled the sensor, then i bumped the starter 3 times before starting. While i was bumping the starter waiting for the lift pump to stop i noticed a constant 15psi on the gauge. Then obviously the gauge went to zero which is when i bumped again, then a third time. After bumping, i started the truck and noticed about 14psi for no less then 5 seconds. Then the gauge went to 2 psi at idle. I took the truck on another test ride and it goes to like 17 at wot. Im basically stunned. I know i should be seeing about 10psi at wot and 15-16 at idle. If the truck didnt rise at wot, i would think that i need a new lift pump, but since the gauge rises instead of falls, i have no clue whats up. Any ideas

Eric

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post #3 of 10 (permalink) Old 04-02-2008, 04:43 AM
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That beats me man. I can't think of why it would do that. Hope you get it sorted out, or else the gauge really doesn't do you much good.
Sean

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post #4 of 10 (permalink) Old 04-02-2008, 04:48 AM Thread Starter
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i hear that. One good thing that came of this...it looks good in that cubby. ill try to get a pic up of it. Looks almost factory optioned. Do you think i need a needle valve to dampen the pulses? Should i unscrew the sender and install a needle valve the run a fuel line from that to the sender(mounted vertically) somewhere else in the engine compartment?

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post #5 of 10 (permalink) Old 04-02-2008, 04:30 PM
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Quote:
Originally Posted by cursedtofirst45
i hear that. One good thing that came of this...it looks good in that cubby. ill try to get a pic up of it. Looks almost factory optioned. Do you think i need a needle valve to dampen the pulses? Should i unscrew the sender and install a needle valve the run a fuel line from that to the sender(mounted vertically) somewhere else in the engine compartment?
I would install a needle valve to dampen the pulses either way. If not the pulses could be messing with the sender.

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post #6 of 10 (permalink) Old 04-02-2008, 06:54 PM Thread Starter
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does the sender have to be mounted vertically?

Eric

1994 Dodge Ram 2500

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post #7 of 10 (permalink) Old 04-03-2008, 12:20 AM Thread Starter
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screw it. I went and bought a $20 ball valve and installed it. Still no change, i also checked the connections. I think either the sender is bad or the gauge is bad. Maybe both. Im sending them back.

Beware Glowshift fp gauges.

Eric

1994 Dodge Ram 2500

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post #8 of 10 (permalink) Old 04-03-2008, 01:47 AM
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Get a good mechanical gauge (DiPricol, Autometer, ISSPro) and skip the isolator...:

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
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post #9 of 10 (permalink) Old 04-03-2008, 02:44 AM Thread Starter
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Originally Posted by Mopar1973Man
Get a good mechanical gauge (DiPricol, Autometer, ISSPro) and skip the isolator...:
im already there. Im probably gonna go dipricol since you've been running it for 4 years w/o any problems. I think its just way too coincidental that the first fp gauge i get from glowshift doesnt work. Therefore their products mean little to me

Eric

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post #10 of 10 (permalink) Old 04-03-2008, 02:47 AM
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Quote:
Originally Posted by cursedtofirst45
im already there. Im probably gonna go dipricol since you've been running it for 4 years w/o any problems. I think its just way too coincidental that the first fp gauge i get from glowshift doesnt work. Therefore their products mean little to me
Right on...:Thumbup:

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116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
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