Will a fuel tank from a 1991 fit in a 1988 truck I ask because the sender went out I tried cleaning it it did nothing and my dad wants it fixed I can't find the sender for an 88 but can get them from an 1992 and a tank?

 

I just looked at RA and the fuel tank straps for the 88 and 91 are the same so at a guess the tank would fit. The issue I think you may run into is the 91 fuel pump may have a higher pressure output than the 88 is designed for.

 

That, and I think the connectors are different.

What did you do to clean the sender? Did you also carefully retension the fingers?

RwP

 

I used contact cleaner and a small soft wire brushand the fingers had a small hole worn in center so st put a drop of solder to fix it and still nothing. As far as pressure shouldn't regulator control pressure? And fittings I'll modify also the plug is a 5 pin different shape I also know I'll have to swap pigtail.

 

No; the pressure of the FINGERS on the WIPER against the WIRE in the sender.

NOT the Fuel pressure.

Mine were sprung up when I redid mine.

I had to disassemble it; I used a dollar bill corner to polish the wire and the fingers; and I slightly bent the fingers to put the connection under mild tension again.

Easy does it; you don't want it binding, but you DO want it making contact.

Did you check to see if it was making contact?

But yes, the regulator on the throttle body should handle the fuel pressure fine. If it doesn't, an inline non-return regulator can be added; the injectors need 14.5psi to operate properly, so I'd look for about 20 to 50 psi as the output of a non-return regulator.

RwP

 

Yes the little prongs or fingers you describe had holes worn through so I filled them with solder to cover the hole so it makes contact with wire looming. I think there's a break in the wire loom as there's some corrosion. I figured I'd have to modify the fittings on the top of sending unit for fuel lines and electrical connection that's no problem I just don't know if physically the tank will fit in that's my only question.

 

The tank will physically fit in all right.

It becomes a bit easier to cipher this out if you'll download the parts book for both your 88 and for the donor year truck from the FAQ here; it's amazing how few parts actually changed during the production run.

Note: If the part number changes, that doesn't necessarily mean they don't SWAP; change could have been a regulatory requirement (like newer filler necks may have had an anti-siphon valve added) or even a different manufacturer for the same part!

RwP