Fuel Problems?

[Branger2B]

hey guys my 88 2.9l keeps acting up. it was a problem that started slow but now is a big problem that wont go away.. it feels like the fuel filter is clogged because when i give it gas all it does is die. so i replaced the fuel filter and it makes no difference removed the sock off the fuel pump in the tank which was slightly clogged. but that didnt help either. im thinking it might be the fuel pressure regulator? has anyone else experienced this before? when i cycle the key i can hear the pump run. the truck will start and idle but wont go more than 5kmh.. and almost dies when i even feather the gas pedal? any help would be greatly appreciated.. do you think it could be the pump on the inside of the frame rail? which of the pumps is the high pressure the one on the frame or in the tank?

 

[Psychopete]

do you think it could be the pump on the inside of the frame rail? which of the pumps is the high pressure the one on the frame or in the tank?

It's really hard to tell with out a fuel pressure tester. If you have fuel in the vacuum line from the FPR to the upper intake, that's a sure sign that it's bad, but if you should really test the fuel pressure otherwise.

High pressure is in the frame rail, low pressure is in the tank, it feeds the frame rail pump.

Have you had any CELs present?

Pete

 

[AllanD]

Any Ranger old enough to have a frame rail mounted pump doesn't
have a Check Engine light.

If the high pressure pump (on the frame rail) is dead then the engine won't run at all.

A dead in-tank behaves rather like you are describing, basically it mimics a clogged fuel filter.

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[Psychopete]

Any Ranger old enough to have a frame rail mounted pump doesn't have a Check Engine light.

My 88 has a functioning CEL and a frame mounted pump. Want pics?

Pete

 

[AllanD]

There is a position in the idiot light "mask"
But on ALL of the ones I've seen the hole for the bulb
socket wasn't even "punched out" on the flex circuit
on the back of the cluster.

Is your '88 Cali emissions?

BTW, it it a CEL light or an "Emmissions" light?

The Emmisions lamp has NO connection whatsoever to the PCM
It's actually connected to a timer (officially called "Infered mileage sensor") that's mounted to the dash next to the key warning buzzer (above the glovebox)

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[Psychopete]

Is your '88 Cali emissions?

Originally, no. Now, kind of... I switched to a '90 MAF PCM about 3 years ago or so, but I didn't have to do anything with the self test harness or dash wiring or anything like that. It was actually a very strait forward change.

BTW, it it a CEL light or an "Emmissions" light?

It's an actual "Check Engine" orange light in the lower left if I remember correctly. I had some wiring issues at the PCM wiring harness that was tripping it, when I pull codes I actually use the MIL to blink them out. Maybe it's an early model '88 thing? It never had EGR, so I know for sure it's an '88+. Seems like it's a middle of the road deal, removed EGR, but didn't go to the single pump design until '89?

Pete

 

[Branger2B]

Any Ranger old enough to have a frame rail mounted pump doesn't
have a Check Engine light.

If the high pressure pump (on the frame rail) is dead then the engine won't run at all.

A dead in-tank behaves rather like you are describing, basically it mimics a clogged fuel filter.

AD


hey guys
thx for you input. my rig is accually an 88b2 frame with an 86 ranger cab on it and it does have both check engine light, and frame mounted pump. you think it may be a dead intank pump? i can hear the pump run when i cycle the key though so im not too sure thats it but then again it could be the one on the frame im hearing. but will change it anyways. see what happens. are you shure it isnt the FPR?

 

[southernlifttruck41]

I have a 88 ranger 4x4 and it has a check engine light. It is a true 88 with 64,000 miles and a frame mounted and a tank mounted fuel tank. The tank pump is a low pressure and the one on the rail is a high pressure. The low pressure high volume pump feeds the high pressure. The high pressure feeds the fuel regulator and the fuel rail. Fuel rail feeds the injectors.