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Old 04-10-2006, 12:13 PM
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Fuel system woes

Here's what I've got; '88 Mustang LX that has a 429 in it. The car is race only and is used at the strip and auto-x. I originally built it 4 years ago and have ran it for 4 seasons. Last year I started having fuel starvation problems which lead to the point on no fuel pressure. I removed the mechanical fuel pump(big Holley, not OEM) thinking it was the culprit. The fuel pump appears to work just fine off the car. I figured since the pump has a monster spring, and since I re-used original eccentric ring on the front of the cam(questionable mileage/ came with the motor) it was probably toast. I figured I'd just run a block off plate and an electric pump. The car has 3/8" line running from the tank to the front. I also gutted the original FI pickup and it is 3/8" as well. I installed the new pump under the backseat floor on the driver's side. It sits below the tank. Well after everything is said and done, still no fuel pressure. I think it may have something to do with the pickup now, but how does the pump in relation to the tank affect things? I probably could move the pump back some more above the axle, but the floor was one of the easier locations. Any suggestions? Thanx! BTW, like I said, the old setup worked fine for 3 seasons...

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Old 04-10-2006, 12:19 PM
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I'd pull the tank, and remove the sender/pickup out. It sounds like a line cracked or has a hole in it inside the tank, or the pickup is collapsed or plugged.
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Old 04-10-2006, 12:36 PM
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That's what I'm guessin' now too. Does the location of the pump sound OK?
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Old 04-10-2006, 12:38 PM
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How far ahead of the tank is it. Below tank level is good, but if I remember right, they are supposed to be approx one foot from the tank for optimal results. If it's around there, you sound good.
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Old 04-10-2006, 12:47 PM
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It's about 18" ahead of the tank. Just in front of the axle. If I put it above the axle then it will be mounted to the floor at the same level as the top of the tank.
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Old 04-10-2006, 12:54 PM
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Fuel system woes

Most electric pumps are designed to push and don't pull to well. But with the short distances you are talking about that should not be a problem. Did you check the fuel filter?
Where are you measuring your fuel pressure ? Do you have pressure right after the pump?

Last edited by home brew; 04-10-2006 at 12:56 PM. Reason: additional questions
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Old 04-10-2006, 06:57 PM
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And the problem was...



$0.50 worth of hose... Oh well, live and learn. Question is, does race gas eat rubber hose? I noticed everything I replaces was getting hard and crunchy. More so than you'd think in just a few years.
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