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Old 06-27-2012, 10:20 PM   #1 (permalink)
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Bad injector pump symptoms?

Cool story, bro.

But please bear with me.

The other day it was hot, 100+.

After 20 minutes of normal driving, I parked it and went inside. About 35 minutes I left again. The truck took about 5 seconds of cranking to start, normally I bump the keyswitch and it fires right up.

I get going down the road and the truck dies. 20 seconds of cranking, it fires up. The rpms go up and down about 200 rpm then smoothes out. I pull back out into traffic, push the clutch down to shift, the truck dies again. Repeat, starting 20 seconds of cranking truck fires up. Open the hood while it is idling, I hear a loud clacking from the front of the injector pump. Fuel pressure regulator?

I decide to take it home. I get going down the road, go to shift, and the rpms shoot to 4k. I shut engine off immediately. Restart it again, truck acts the same as before - hard to start and rpm fluctuates, then smooths out.

I am baffled as to what is going on. It acts like it's running out or starving for fuel, then the engine races to 4k. I replaced the lift pump, fuel pressure regulator and all rubber lines with marine hose last year.

I haven't been able to duplicate this problem again, as its only been about 80 ish outside. I want to get a fuel pressure gauge on it when it's acting up, but it hasn't since.

I saw on this site about warped injector cups on 94/95 trucks. Could the extreme heat cause this problem?

What are the symptoms of having warped cups?

Anybody have this problem?

Thanks!
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Old 06-27-2012, 11:24 PM   #2 (permalink)
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Take a big bucket of cold water with you. If it acts up pour the cold (not warm) water on the injection pump. If it straightens out the injection pump is bad.
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Old 06-28-2012, 12:15 AM   #3 (permalink)
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Ya try that otherwise it's prolly a bad lift pump or leak

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Old 06-28-2012, 12:47 AM   #4 (permalink)
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Try checking the fuel pressure first and make sure you're maintaining at least 20 psi at all times. It's best to replace the cheap simple things before jumping on a 1k or more injection pump. It could be a leak or clog somewhere, bad overflow valve, dirty pre filter, dirty fuel filter, or the fuel pump. As for the 4k rpm issue you should take a look at the throttle linkage and the return spring.
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Old 06-28-2012, 09:03 PM   #5 (permalink)
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Thanks for the replies. It is going to be 96 this weekend, I'll run her hard and see what happens. I'll hook up a fuel pressure gauge and keep some cold water in the cab for when it messes up.
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Old 06-28-2012, 11:59 PM   #6 (permalink)
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Water in fuel filter maybe

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Old 06-29-2012, 09:00 PM   #7 (permalink)
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Today it was 100 degrees. Drove truck home (about 6 miles) with fuel pressure gauge hooked up. At idle I have 20psi, at 2000k I have 26psi, at wot in second gear it goes down to 10.

So, after a new lift pump, overflow valve, all new marine rubber fuel lines, fuel heater delete mod, my pressure is still crap.

I let the truck sit for about 20 minutes and tried to start it. It took about five seconds of cranking then fired up. Idle pressure was the same. I revved it to 2k, pressure was about 22psi fluctuating to 25psi so fast my gauge and hose to my gauge was "clicking". Then the truck revved to 3600rpm and shut off.

I got a gallon jug of cool tap water and dumped it on the injector pump. I fired it up, and it ran perfect! No excessive cranking, no out of control over revving, no shutting off. It's like this damn this has vapor lock!

I know my fuel pressure is still low (guess it's time for a draw straw uprgrade), am I correct in thinking my injector pump is toast?
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Old 06-29-2012, 09:22 PM   #8 (permalink)
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Correct

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Old 06-30-2012, 09:31 PM   #9 (permalink)
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If you still have low fuel pressure after all the new parts it is probably the Over flow valve, take it off and stretch the spring 1/8th of an inch and recheck the pressure.
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Old 07-01-2012, 10:10 AM   #10 (permalink)
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Quote:
22psi fluctuating to 25psi so fast my gauge and hose to my gauge was "clicking"
If you didn't have a gauge snubber or needle valve barely cracked open to control pulsations your pressure readings are worthless and the gauge may have been destroyed as far as ever reading right again.

How to check fuel pressure on a 12 valve
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Old 07-06-2012, 04:02 PM   #11 (permalink)
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Quote:
Originally Posted by illflem View Post
If you didn't have a gauge snubber or needle valve barely cracked open to control pulsations your pressure readings are worthless and the gauge may have been destroyed as far as ever reading right again.

How to check fuel pressure on a 12 valve
Nope, followed those directions to a tee. I have a needle valve that is barely cracked open and a fairly expensive liquid filled 60lb gauge I use at work to check pilot pressures on various hydraulically operated machines.

The "clicking" only happens once the truck is warm and had been driven awhile.

Since it has been in the 80's, I have no problems.



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Last edited by RichN; 07-06-2012 at 04:16 PM.
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Old 08-05-2012, 05:42 PM   #12 (permalink)
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Did you ever figure this one out? My truck is doing almost the same thing. The ticking noise at the p pump, hard starting if it dies but sits for a while runs fine, sometimes takes off to redline, cannot create the issue, it is random. I did a lot of the same stuff, checked the pickup in the tank and the lines, replaced a couple of the soft lines, deleted fuel heater, cleaned prescreen and put on a new fuel filter. I just got some gauges installed and the correctly installed fuel pressure gauge was reading the same during the issue and when the truck is running fine, I had ordered an overflow valve withe gauges, pulled over and swapped it out, gained a pound of fuel pressure but still having the same issue. Unfortunately this leads me to believe it is a pump issue. here is the link to my previous post Driveability/Fuel Issue
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