I think my fuel pump is shi!^^!ng the bed

fmxona500 · October 16th, 2010, 12:59 PM

Have a 255 walbro with a KB boost pump and I believe it's on it's way out.

Started last week on occasion the pump wont kick on right away. I have to cycle the key once or twice to hear it engaging so it would start.

Finally got a chance to run my fuel pressure yesterday.
Key on engine off, zero pressure
Key on engine running 30 psi w/ vac
Running w/ vac it bounces alittle under acceleration. Starts to increase pressure, then fluctuates between 28 - 34 before stabilizing at 30psi.
Running no vac 40psi

As soon as I kill the engine, psi drops to zero. What do you guys think? Pump?

sharkbait · October 16th, 2010, 01:04 PM

Fuel pressure regulator maybe?

i also though it was supposed to run at 30 psi

ryanbiggame · October 17th, 2010, 12:31 AM

Originally Posted by sharkbait

Fuel pressure regulator maybe?

i also though it was supposed to run at 30 psi

I'm planning to upgrade my stock fuel pump to a BBK 255 to support my pi swap, do I need to buy adjustable fuel regulator too? Or keep my stock one I got now?

p4ndiamond · October 18th, 2010, 09:24 AM

I would check the fuel relay first sounds like it could be that.

fmxona500 · October 27th, 2010, 01:45 PM

Problem fixed. Frayed wires in the harnesses for the pump and boost a pump. Probably happened from that stupid tire I hit at 70 a few weeks back.

October 16th, 2010, 12:59 PM	#1
fmxona500 Enthusiast 1996 Mustang I take myself way too seriously. Join Date: Apr 2010 Posts: 545 iTrader: 0 reviews	I think my fuel pump is shi!^^!ng the bed Have a 255 walbro with a KB boost pump and I believe it's on it's way out. Started last week on occasion the pump wont kick on right away. I have to cycle the key once or twice to hear it engaging so it would start. Finally got a chance to run my fuel pressure yesterday. Key on engine off, zero pressure Key on engine running 30 psi w/ vac Running w/ vac it bounces alittle under acceleration. Starts to increase pressure, then fluctuates between 28 - 34 before stabilizing at 30psi. Running no vac 40psi As soon as I kill the engine, psi drops to zero. What do you guys think? Pump? Last edited by fmxona500; October 16th, 2010 at 01:02 PM.

October 16th, 2010, 01:04 PM	#2
sharkbait Hooo Ha Ha 1997 Mustang GT 11.65 @ 115 Join Date: Apr 2009 Location: Pasadena MD Posts: 9,743 iTrader: 10 reviews	Fuel pressure regulator maybe? i also though it was supposed to run at 30 psi __________________ 410rwhp 520rwtq @ 12.9 psi

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October 18th, 2010, 09:24 AM	#4
p4ndiamond Hardcore Enthusiast 1997 Pacific Green Cobra 14.80 No traction Join Date: May 2010 Location: New Orleans Posts: 1,216 iTrader: 0 reviews	I would check the fuel relay first sounds like it could be that.

October 27th, 2010, 01:45 PM	#5
fmxona500 Enthusiast 1996 Mustang I take myself way too seriously. Join Date: Apr 2010 Posts: 545 iTrader: 0 reviews	Problem fixed. Frayed wires in the harnesses for the pump and boost a pump. Probably happened from that stupid tire I hit at 70 a few weeks back.

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